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Add support for a few more keywords (`true`, `false`, `if`, `else`,
`return`).
All keywords are grouped together in the constant declaration.
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Support additional tokens for operators (`-`, `*`, etc). This change
only adds the tokens to the list of constants, and group all the tokens
related to operators together.
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This is the initial tokenizer for the monkey language. For now we
recognize a limited number of tokens.
We only have two keywords at this stage: `fn` and `let`. `fn` is used to
create function, while `let` is used for assigning variables.
The other tokens are mostly to parse the source code, and recognize
things like brackets, parentheses, etc.
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